I am still using WXP, but have switched to RM4. The version of RM does not matter, as long as both copies described below are the same version.. I set up a folder on my C Drive of my desktop called "Genealogy". That is where I direct RM to store all of the Data files and also where I store my RM Multimedia file. It is also a good place to keep a backlog file if you have one. You may have yours in your "My Documents", that's OK.
With that said, I use an external backup program that automatically backs up my desktop Genealogy file to an external Hard Drive daily. Using the same backup program installed on my laptop, I manually backup as required, from the external HD to the laptop's Genealogy File, that "has" to be installed in the same location, on the laptop's C Drive, and with RM set up on both computers exactly the same.
The bonus here is two cloned copies of your work. The external HD provides protection against a drive failure on your desktop; and the copy on your laptop will provide protection should you get a virus on your desktop, that could infect the external HD. You would maybe like to backup to your laptop on a weekly basis, or as appropriate to the amount of work that you do, and not just as you need it.
The Backup Program that I use is SyncBack SE; can be installed on up to 5 computers, and although it is a paid program, has been well worth the money to me. See: http://www.2brightsparks.com/
Remember: Set up both RM's and computer's exactly the same. Good Luck.
thank you so much. Ironically, it was my son's recommendation to use a backup program that got me serious about trying to clean up this mess and I really appreciate the info! Everyone here is so kind, it's very nice.